Hole saw



FIG. 1 is a perspective view of a hole saw showing the present invention;

FIG. 2 is a front elevational view thereof, the rear elevational view being identical;

FIG. 3 is a left side elevational view thereof; the right side elevational view being identical;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines in the figures show structure or boundaries that are not part of the claimed design. 

The ornamental design for hole saw, as shown and described. 